mirror of
https://github.com/bytedance/deer-flow.git
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0f82f8a3a2
Add new application structure: - app/main.py - application entry point - app/plugins/ - plugin system with auth plugin: - api/ - REST API endpoints and schemas - authorization/ - auth policies, providers, hooks - domain/ - business logic (service, models, jwt, password) - injection/ - route injection and guards - ops/ - operational utilities - runtime/ - runtime configuration - security/ - middleware, CSRF, dependencies - storage/ - user repositories and models - app/static/ - static assets (scalar.js for API docs) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
107 lines
3.1 KiB
Python
107 lines
3.1 KiB
Python
"""CSRF protection middleware and helpers for cookie-based auth flows."""
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import secrets
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from collections.abc import Callable
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from fastapi import Request, Response
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from starlette.middleware.base import BaseHTTPMiddleware
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from starlette.responses import JSONResponse
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from starlette.types import ASGIApp
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CSRF_COOKIE_NAME = "csrf_token"
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CSRF_HEADER_NAME = "X-CSRF-Token"
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CSRF_TOKEN_LENGTH = 64 # bytes
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def is_secure_request(request: Request) -> bool:
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"""Detect whether the original client request was made over HTTPS."""
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return request.headers.get("x-forwarded-proto", request.url.scheme) == "https"
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def generate_csrf_token() -> str:
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"""Generate a secure random CSRF token."""
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return secrets.token_urlsafe(CSRF_TOKEN_LENGTH)
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def should_check_csrf(request: Request) -> bool:
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"""Determine if a request needs CSRF validation."""
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if request.method not in ("POST", "PUT", "DELETE", "PATCH"):
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return False
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path = request.url.path.rstrip("/")
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if path == "/api/v1/auth/me":
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return False
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return True
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_AUTH_EXEMPT_PATHS: frozenset[str] = frozenset(
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{
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"/api/v1/auth/login/local",
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"/api/v1/auth/logout",
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"/api/v1/auth/register",
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"/api/v1/auth/initialize",
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}
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)
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def is_auth_endpoint(request: Request) -> bool:
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"""Check if the request is to an auth endpoint."""
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return request.url.path.rstrip("/") in _AUTH_EXEMPT_PATHS
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class CSRFMiddleware(BaseHTTPMiddleware):
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"""Implement CSRF protection using the double-submit cookie pattern."""
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def __init__(self, app: ASGIApp) -> None:
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super().__init__(app)
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async def dispatch(self, request: Request, call_next: Callable) -> Response:
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_is_auth = is_auth_endpoint(request)
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if should_check_csrf(request) and not _is_auth:
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cookie_token = request.cookies.get(CSRF_COOKIE_NAME)
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header_token = request.headers.get(CSRF_HEADER_NAME)
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if not cookie_token or not header_token:
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return JSONResponse(
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status_code=403,
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content={"detail": "CSRF token missing. Include X-CSRF-Token header."},
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)
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if not secrets.compare_digest(cookie_token, header_token):
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return JSONResponse(
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status_code=403,
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content={"detail": "CSRF token mismatch."},
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)
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response = await call_next(request)
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if _is_auth and request.method == "POST":
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csrf_token = generate_csrf_token()
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response.set_cookie(
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key=CSRF_COOKIE_NAME,
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value=csrf_token,
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httponly=False,
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secure=is_secure_request(request),
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samesite="strict",
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)
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return response
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def get_csrf_token(request: Request) -> str | None:
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"""Get the CSRF token from the current request's cookies."""
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return request.cookies.get(CSRF_COOKIE_NAME)
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__all__ = [
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"CSRF_COOKIE_NAME",
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"CSRF_HEADER_NAME",
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"CSRFMiddleware",
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"generate_csrf_token",
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"get_csrf_token",
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"is_auth_endpoint",
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"is_secure_request",
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"should_check_csrf",
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]
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